Everything a programmer does is "hand rolled" whether it's JS or JSX.
You'll still have to tackle those complex requirements and come up with a good design that organizes things and makes them manageable, whether you're using React and JS or just JS.
To say that a good design is just impossible with JS or that no other engineers could possibly understand the resulting code seems absurd.
Javascript is a Turing-complete language. It gives you a lot of design options. Your poor engineers will have to learn it to use React anyway so why would vanilla js necessarily be worse than js plus a giant framework?
You'll still have to tackle those complex requirements and come up with a good design that organizes things and makes them manageable, whether you're using React and JS or just JS.
To say that a good design is just impossible with JS or that no other engineers could possibly understand the resulting code seems absurd.
Javascript is a Turing-complete language. It gives you a lot of design options. Your poor engineers will have to learn it to use React anyway so why would vanilla js necessarily be worse than js plus a giant framework?